Kotaro Yamagishi

Founder at GREE HOLDINGS, INC.

Net worth: 2 M $ as of 2026-06-29

50 year

56 connections

Technology Services

Consumer Services

Finance

Profile

Kotaro Yamagishi is the founder and currently holds the position of Non-Executive Director at GREE, Inc., a company founded in 2004.
He is also the founder and Chief Executive Officer of Keio Innovation Initiative, Inc., founded in 2015.
Mr. Yamagishi completed his undergraduate degree at the Graduate School of Economics, Keio University in 1999.

Known holdings in public companies

Company	Date	Number of shares	Valuation	Valuation date
GREE HOLDINGS.INC. 0.52%	2025-12-30	939,000 ( 0.52% )	2 M $	2026-06-29

Kotaro Yamagishi active positions

Companies	Position	Start
GREE HOLDINGS, INC.	Founder	2004-12-06
Keio Innovation Initiative, Inc. Keio Innovation Initiative, Inc. Investment ManagersFinance Keio Innovation Initiative invests in companies located in Japan. The firm focuses on the Life Science and Technology sectors. It provides financing for seed, early and later stage capital requirements with an investment size of JPY 50 – 2000 million. It also acts as a lead investor and makes follow on investment.	Founder	2015-12-16

All active positions of Kotaro Yamagishi

Training of Kotaro Yamagishi

Experiences
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Linked companies

Private companies	3
GREE, Inc. GREE, Inc. Packaged SoftwareTechnology Services Engages in the operation and development of Internet media services centered on smartphone with social network system, social games and other entertainment elements	Technology Services
Graduate School of Economics, Keio University Graduate School of Economics, Keio University Other Consumer ServicesConsumer Services Functions as a College/University	Consumer Services
Keio Innovation Initiative, Inc. Keio Innovation Initiative, Inc. Investment ManagersFinance Keio Innovation Initiative invests in companies located in Japan. The firm focuses on the Life Science and Technology sectors. It provides financing for seed, early and later stage capital requirements with an investment size of JPY 50 – 2000 million. It also acts as a lead investor and makes follow on investment.	Finance